The Cigar one of these objects is an example of the starburst type, and starbursts can also occur when these objects collide. Seyfert ones of these contain active nuclei which are believed to contain supermassive black holes. Edwin Hubble created a "tuning fork" mechanism for classifying these as barred spiral, elliptical, or spiral. For 10 points, name these groups of bil
The Cigar one of these objects is an example of the starburst type, and starbursts can also occur when these objects collide. Seyfert ones of these contain active nuclei which are believed to contain supermassive black holes. Edwin Hubble created a "tuning fork" mechanism for classifying these as barred spiral, elliptical, or spiral. For 10 points, name these groups of billions of stars, which include the nearby Andromeda and our own Milky Way.
The Cigar one of these objects is an example of the starburst type, and starbursts can also occur when these objects collide.
{galaxies} [or {galaxy}]